But this helps!
Bit the first: an all-violin-and-piano arrangement of "Human" by The Killers:
I may just have to buy the album for this one. :)
Bit the second: Simon from "Alvin and the Chipmunks" sings "Viva la Vida" by Cold Play:
I realize the pic is Theodore, and I also realize how peculiar it is to know which Chipmunk is which. But I loved those guys when I was a kid! (And for that matter, I realize it's not really the Chipmunks, but it's fun to pretend.)